Legal Responsibility

I took out an Avis plan to service my car that I bought from Barons Bellville. The original plan was for 3 years and they were pushing me to extend it to 5 years or 60 000km and the policy was included in my repayment, meaning that I am still paying for this policy. I only now found that it was actually a maintenance plan and the they should have paid for the wiper blades(twice) and bulbs that I replaced more than twice. This is our family's secondary car and we don't drive a lot with it. The car has had it's 15 000 km, the 30 000 km and the 45 000 km service. Barloworld Motor Retail (who is the underwriter of the policy) now have to do the 60 000 km service, but they refuse to do it, because we should have done the service in 2017. The service light only came on in the last 2 months